Men’s disputed and unofficial marathon world records
1963 – Brian Kilby – 2:14:43 – Hirvi racing flat
1969 – Derek Clayton – 2:08:33.6 – Adidas Marathon
1981 – Alberto Salazar – 2:08:13 – Nike Skylon Racer
2011 – Geoffrey Mutai – 2:03:02 – Adidas AdiZero Adios
2017 – Eliud Kipchoge – 2:00:25 – Nike Zoom VaporFly Elite
2019 – Eliud Kipchoge – 1:59:40 – Nike Air Zoom AlphaFly Next%